[Android][Error]The connection to adb is down, and a severe error has occured

Message:

The connection to adb is down, and a severe error has occured.

You must restart adb and Eclipse.

Please ensure that adb is correctly located at '/.../.../android-sdks/platform-tools/adb' and can be executed.

Solve:

[OS - UBUNTU]

 1) sudo ./adb kill-server

 2) sudo ./adb start-server

[OS - WINDOWS]

 1) adb kill-server

 2) adb start-server